单项选择题

Why are very hot stars referred to as "ghosts"

A．They are short-lived.
B．They are frightening.
C．They are mysterious.
D．They are nearly invisible.
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单项选择题
What is the passage about
A．Faint dwarf stars.
B．The evolutionary cycle of the Sun.
C．The Sun's fuel problem.
D．The dangers of invisible radiation.
单项选择题
Most disabled people used to die early because ______.
A．disabilities destroyed major bodily functions
B．they were not very well looked after
C．medical techniques were not available
D．they were too poor to get proper treatment
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